Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 65
a standard or by calculation. The Weston Voltmeter. The principle of theWeston voltmeter or ammeter for direct currentis that of the DArsonval galvanometer. The mov-ing coil is mounted on pivots between jeweled cen-tres instead of being suspended from wires orthreads. This mounting permits of… … Fig. 29. In the portable instruments the data of resist-ance, etc., will be found printed on the inside ofthe lid. Care should be taken not to interchange VOLTMETERS AND AMMETERS, 43 the case lids, each instrument bears a serial num-ber. The laboratory type, Fig. 31, has a very largescale of…
Electric testing · Electric apparatus and appliances
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